but it took a lot of searching.
http://education.guardian.co.uk/alevels2003/story/0,13394,1144340,00.html"It is possible that the days of the free-standing AEA are numbered anyway. In its interim review, published last summer, the 14-19 curriculum working group, headed by Mike Tomlinson, proposed a diploma system, the highest of which would integrate AEA-level material. But for now, there's a Catch-22 situation: until more schools offer the qualification, universities are unlikely to put much emphasis on it. And until universities put more emphasis on it, schools are unlikely to offer it as a matter of course.
...
The Department for Education and Skills and the exam regulator, the Qualifications and Curriculum Authority, are both positive about the AEA, each citing the introduction of AEAs in some additional subjects next year as evidence of its increasing popularity. But there are no immediate targets for increasing uptake: it is intended as an option only for the best of the best, after all. AEA entry rates are higher than those of the special paper, the extra qualification it replaced, which was declining in popularity and was offered predominantly by independent schools. The special paper had 4,452 entrants in 2001, its swansong year. In 2002, 6,841 entered for the first set of accredited AEAs, a figure that rose to 7,230 last year, according to Joint Council for General Qualifications data. It was a far from overwhelming take-up. More than 750,000 A-levels were taken last summer.
The AEA retained the special paper's grading system, with just under half of entrants receiving a merit or distinction, and the rest registering as unclassified. Unlike the special paper, which required extra preparation on top of an A-level curriculum, the AEA was designed to be accessible to all students, regardless of the resources their school possessed. Although universities are turning elsewhere to assess their applicants, the AEA does seem, as was hoped, to be stretching and stimulating the most able pupils - at least, those of the most able that have the opportunity to take it."
So, there are about 100 A levels taken for each AEA. I was at an independent school; I'd guess the total numbers taken in the whole year were 400 A levels, and 30 S levels. But since Milliband said 1 in 30 of all pupils (ie 1 in 15 of those taking A levels) get 3 As, you'd think they could use them to differentiate. But the article says not many universities pay attention to them. Oh well.